Today another exploit for the MS04-28 , regarding the JPG, was public released. This one will open a command prompt in your machine.

The first PoC (proof-of-concept) released some days ago is already detected by some AV vendors. According to the free service VirusTotal, Symantec, Trend, Kaspersky and McAfee detects the malformated jpeg headers. So, if you run updated versions, you should be safe.

On the other hand, if we are seeing exploits opening command prompts, something worst is on its way...

So, please, remember to apply Microsoft Patches in your and your friends and family computers (I already applied on my mother's windows box...). Companies should test it and also apply as soon as possible...
Remember that patches are not to be applied only when a new malware is exploiting the vulnerability, so dont wait for it as a reason to apply the patches.